Mitsubishi Lancer Evolution IX. Manual — part 588

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-35

STEP 5. Connectors check: C-26 4WD-ECU
connector, C-122 intermediate connector, C-230
steering wheel sensor connector <LH drive
vehicles> or C-26 4WD-ECU connector, C-138
intermediate connector, C-230 steering wheel
sensor connector <RH drive vehicles>.

Check for the contact with terminals.

Q: Is the check result normal?

YES :

Go to Step 6.

NO :

Repair the defective connector.

AC311002

4WD-ECU

Harness side

C-26 (Y)

AC

Connector: C-26

4WD-ECU

C-26 (Y)

Rear console
assembly

<LH drive vehicles>

<RH drive vehicles>

AC311015AC

Connector: C-122 <LH drive vehicles>

C-122

AC311016AB

Connector: C-138 <RH drive vehicles>

C-138

AC311035

<LH drive vehicles>

Harness side

C-230

AB

Connector: C-230

<RH drive vehicles>

C-230

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-36

STEP 6. Check the harness between 4WD-ECU
connector C-26 (terminal No.33, 34) and steering
wheel sensor connector C-230 (terminal No.5, 4).

Check the output line for open circuit.

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Repair the wiring harness.

STEP 7. Replace the steering wheel sensor and
then recheck the diagnosis code.
(1) Replace the steering wheel sensor.
(2) Test drive the vehicle.
(3) Check the diagnosis code.

Q: Is the diagnosis code set?

YES :

Go to Step 4.

NO :

The inspection is complete.

AC311002

4WD-ECU

Harness side

C-26 (Y)

AC

Connector: C-26

4WD-ECU

C-26 (Y)

Rear console
assembly

<LH drive vehicles>

<RH drive vehicles>

AC311035

<LH drive vehicles>

Harness side

C-230

AB

Connector: C-230

<RH drive vehicles>

C-230

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-37

Code No.41, 42 Throttle position sensor system

OPERATION

The 4WD-ECU receives a change in the output volt-
age from the throttle position sensor to determine the
accelerator pedal opening angle.

DIAGNOSIS CODE SET CONDITIONS

• Code No.41 is set as excessively small output

when the TPS output is below 0.2 V In the idling
state.

• Code No.42 is set as excessively large output

when the TPS output is more than 4.8 V for more
than 2 minutes continuously below a vehicle
speed of 10 km/h.

PROBABLE CAUSES

• Malfunction of the throttle position sensor

• Damaged harness wires and connectors

• Malfunction of the 4WD-ECU

DIAGNOSIS

STEP 1. M.U.T.-II/III diagnosis code

Q: Is MPI diagnosis code P0120 set?

YES :

Refer to GROUP 13A

− Inspection Chart for

Diagnosis Codes

P.13A-60

.

NO :

Go to Step 2.

STEP 2. M.U.T.-II/III data list
Item 13: Throttle position sensor voltage (Refer to
data list reference table

P.22A-142

).

Q: Is the check result normal?

YES :

Intermittent malfunction (Refer to GROUP

00

− How to Cope with Intermittent

Malfunction

P.00-5

).

NO :

Go to Step 3.

4WD-ECU

THROTTLE
POSITION
SENSOR

<LH DRIVE VEHICLES> OR
<RH DRIVE VEHICLES>

Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Gray R : Red P : Pink V : Violet

Throttle position sensor system circuit

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-38

STEP 3. Measure the voltage at 4WD-ECU
connector C-26.
(1) Turn the ignition switch to the ON position.

(2) Measure the voltage between 4WD-ECU

connector C-26 terminal No.39 and earth.

OK:

Accelerator pedal fully released: 0.535

−

0.735 V

Accelerator pedal fully depressed: 4.5

− 5.0

V

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Go to Step 6.

STEP 4. Connector check: C-26 4WD-ECU
connector.

Check for the contact with terminals.

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Repair the defective connector.

STEP 5. M.U.T.-II/III data list
Item 13: Throttle position sensor voltage (Refer to
data list reference table

P.22A-142

).

Q: Is the check result normal?

YES :

Intermittent malfunction (Refer to GROUP

00

− How to Cope with Intermittent

Malfunction

P.00-5

).

NO :

Replace the 4WD-ECU.

STEP 6. Check throttle position sensor.
Check throttle position sensor (Refer to

P.13A-404

).

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Repair or replace throttle position sensor.

AC311002

4WD-ECU

Harness side

C-26 (Y)

AC

Connector: C-26

4WD-ECU

C-26 (Y)

Rear console
assembly

<LH drive vehicles>

<RH drive vehicles>

AC311002

4WD-ECU

Harness side

C-26 (Y)

AC

Connector: C-26

4WD-ECU

C-26 (Y)

Rear console
assembly

<LH drive vehicles>

<RH drive vehicles>